I am trying to replicate the scrolling effect from here: http://www.altisliferpg.com/
I have a feeling that they are using a heavily modified version of Bootstrap Navbar, which I have taken from here: http://www.enjin.com/forums/page/1/m/10826/viewthread/8514993-boot-strap-30-navbar-full-module and have changed it to fit into my specific case.
How would I make it so when you scroll down the page, the bar on the top gets "smaller" and scrolls along with the page as you scroll? Thanks
You can use css transitions for the height, font size and whatever else you want changed. Then simply set a scroll listener, which adds a class to the header so the size changes. Quick (and very ugly) example. jsFiddle
$(window).scroll(function () {
if ($(this).scrollTop()) {
$('#header').addClass('small');
}
else {
$('#header').removeClass('small');
}
});
Maybe you should detect the scroll event of the window, after that, set the position of the navbar to fixed and then, perform the animation. Here's an example of the javascript part and a link see it in action:
$(function(){
var performingDownAnimation = false,
performingUpAnimation = false;
var performScroll = function(){
if($("body").scrollTop() > 0) {
if(performingUpAnimation) {
$('#logo').stop();
performingUpAnimation = false;
}
if(!performingDownAnimation){
$('#navbar').addClass('navbar-fixed');
$('#logo').animate({ 'font-size': "12px" }, 1000, function(){
performingDownAnimation = false;
});
performingDownAnimation = true;
}
}else if($("body").scrollTop() == 0){
if(performingDownAnimation) {
$('#logo').stop();
performingDownAnimation = false;
}
if(!performingUpAnimation){
$('#navbar').removeClass('navbar-fixed');
$('#logo').animate({ 'font-size': "48px" }, 1000, function(){
performingUpAnimation = false;
});
performingUpAnimation = true;
}
}
}
$(document).on('scroll', performScroll);
});
On scroll event and position fixed
I edited my response for adding support for the "up" direction too. About using bootstrap for the animation, I have no idea how to do it, and I think it can't be done, because bootstrap is based mainly on applying CSS classes to different elements. CSS classes are discrete, but you are asking for animating something numerical, as the font-size property is. As much, you could create an animation that looks "staggered".
i have created a navigation and when scrolls down after 10 it changes its background color but i want to make it a little smooth to change its bg-color.
my jquery navigation code
var a = $(".navbar-default").offset().top;
$(document).scroll(function(){
if($(this).scrollTop() > 10)
{
$('.navbar-default').css({"background":"#fff"});
}
else
{
$('.navbar-default').css({"background":"transparent"});
}
});
the code i was trying but its not working
$('.navbar-default').css({"background":"#fff"}).show("slow");
When transitioning CSS properties you use jQuery animate. However, you cannot transition non-numeric properties like colors. To do this you can use jquery.color.js :
(function(h,m){function n(a,b,c){var d=r[b.type]||{};if(null==a)return c||!b.def?null:b.def;a=d.floor?~~a:parseFloat(a);return isNaN(a)?b.def:d.mod?(a+d.mod)%d.mod:0>a?0:d.max<a?d.max:a}function s(a){var b=f(),c=b._rgba=[],a=a.toLowerCase();j(v,function(d,g){var e,i=g.re.exec(a);e=i&&g.parse(i);i=g.space||"rgba";if(e)return e=b[i](e),b[k[i].cache]=e[k[i].cache],c=b._rgba=e._rgba,!1});return c.length?("0,0,0,0"===c.join()&&h.extend(c,o.transparent),b):o[a]}function p(a,b,c){c=(c+1)%1;return 1>6*c?
a+6*(b-a)*c:1>2*c?b:2>3*c?a+6*(b-a)*(2/3-c):a}var w=/^([\-+])=\s*(\d+\.?\d*)/,v=[{re:/rgba?\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,parse:function(a){return[a[1],a[2],a[3],a[4]]}},{re:/rgba?\(\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,parse:function(a){return[2.55*a[1],2.55*a[2],2.55*a[3],a[4]]}},{re:/#([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})/,parse:function(a){return[parseInt(a[1],16),parseInt(a[2],16),
parseInt(a[3],16)]}},{re:/#([a-f0-9])([a-f0-9])([a-f0-9])/,parse:function(a){return[parseInt(a[1]+a[1],16),parseInt(a[2]+a[2],16),parseInt(a[3]+a[3],16)]}},{re:/hsla?\(\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,space:"hsla",parse:function(a){return[a[1],a[2]/100,a[3]/100,a[4]]}}],f=h.Color=function(a,b,c,d){return new h.Color.fn.parse(a,b,c,d)},k={rgba:{props:{red:{idx:0,type:"byte"},green:{idx:1,type:"byte"},blue:{idx:2,type:"byte"}}},hsla:{props:{hue:{idx:0,
type:"degrees"},saturation:{idx:1,type:"percent"},lightness:{idx:2,type:"percent"}}}},r={"byte":{floor:!0,max:255},percent:{max:1},degrees:{mod:360,floor:!0}},t=f.support={},u=h("<p>")[0],o,j=h.each;u.style.cssText="background-color:rgba(1,1,1,.5)";t.rgba=-1<u.style.backgroundColor.indexOf("rgba");j(k,function(a,b){b.cache="_"+a;b.props.alpha={idx:3,type:"percent",def:1}});f.fn=h.extend(f.prototype,{parse:function(a,b,c,d){if(a===m)return this._rgba=[null,null,null,null],this;if(a.jquery||a.nodeType)a=
h(a).css(b),b=m;var g=this,e=h.type(a),i=this._rgba=[];b!==m&&(a=[a,b,c,d],e="array");if("string"===e)return this.parse(s(a)||o._default);if("array"===e)return j(k.rgba.props,function(d,c){i[c.idx]=n(a[c.idx],c)}),this;if("object"===e)return a instanceof f?j(k,function(c,d){a[d.cache]&&(g[d.cache]=a[d.cache].slice())}):j(k,function(d,c){var b=c.cache;j(c.props,function(d,e){if(!g[b]&&c.to){if(d==="alpha"||a[d]==null)return;g[b]=c.to(g._rgba)}g[b][e.idx]=n(a[d],e,true)});if(g[b]&&h.inArray(null,g[b].slice(0,
3))<0){g[b][3]=1;if(c.from)g._rgba=c.from(g[b])}}),this},is:function(a){var b=f(a),c=!0,d=this;j(k,function(a,e){var i,h=b[e.cache];h&&(i=d[e.cache]||e.to&&e.to(d._rgba)||[],j(e.props,function(a,d){if(null!=h[d.idx])return c=h[d.idx]===i[d.idx]}));return c});return c},_space:function(){var a=[],b=this;j(k,function(c,d){b[d.cache]&&a.push(c)});return a.pop()},transition:function(a,b){var c=f(a),d=c._space(),g=k[d],e=0===this.alpha()?f("transparent"):this,i=e[g.cache]||g.to(e._rgba),h=i.slice(),c=c[g.cache];
j(g.props,function(a,d){var g=d.idx,e=i[g],f=c[g],j=r[d.type]||{};null!==f&&(null===e?h[g]=f:(j.mod&&(f-e>j.mod/2?e+=j.mod:e-f>j.mod/2&&(e-=j.mod)),h[g]=n((f-e)*b+e,d)))});return this[d](h)},blend:function(a){if(1===this._rgba[3])return this;var b=this._rgba.slice(),c=b.pop(),d=f(a)._rgba;return f(h.map(b,function(a,b){return(1-c)*d[b]+c*a}))},toRgbaString:function(){var a="rgba(",b=h.map(this._rgba,function(a,d){return null==a?2<d?1:0:a});1===b[3]&&(b.pop(),a="rgb(");return a+b.join()+")"},toHslaString:function(){var a=
"hsla(",b=h.map(this.hsla(),function(a,d){null==a&&(a=2<d?1:0);d&&3>d&&(a=Math.round(100*a)+"%");return a});1===b[3]&&(b.pop(),a="hsl(");return a+b.join()+")"},toHexString:function(a){var b=this._rgba.slice(),c=b.pop();a&&b.push(~~(255*c));return"#"+h.map(b,function(a){a=(a||0).toString(16);return 1===a.length?"0"+a:a}).join("")},toString:function(){return 0===this._rgba[3]?"transparent":this.toRgbaString()}});f.fn.parse.prototype=f.fn;k.hsla.to=function(a){if(null==a[0]||null==a[1]||null==a[2])return[null,
null,null,a[3]];var b=a[0]/255,c=a[1]/255,d=a[2]/255,a=a[3],g=Math.max(b,c,d),e=Math.min(b,c,d),i=g-e,h=g+e,f=0.5*h;return[Math.round(e===g?0:b===g?60*(c-d)/i+360:c===g?60*(d-b)/i+120:60*(b-c)/i+240)%360,0===f||1===f?f:0.5>=f?i/h:i/(2-h),f,null==a?1:a]};k.hsla.from=function(a){if(null==a[0]||null==a[1]||null==a[2])return[null,null,null,a[3]];var b=a[0]/360,c=a[1],d=a[2],a=a[3],c=0.5>=d?d*(1+c):d+c-d*c,d=2*d-c;return[Math.round(255*p(d,c,b+1/3)),Math.round(255*p(d,c,b)),Math.round(255*p(d,c,b-1/3)),
a]};j(k,function(a,b){var c=b.props,d=b.cache,g=b.to,e=b.from;f.fn[a]=function(a){g&&!this[d]&&(this[d]=g(this._rgba));if(a===m)return this[d].slice();var b,q=h.type(a),k="array"===q||"object"===q?a:arguments,l=this[d].slice();j(c,function(a,d){var b=k["object"===q?a:d.idx];null==b&&(b=l[d.idx]);l[d.idx]=n(b,d)});return e?(b=f(e(l)),b[d]=l,b):f(l)};j(c,function(d,b){f.fn[d]||(f.fn[d]=function(c){var e=h.type(c),g="alpha"===d?this._hsla?"hsla":"rgba":a,f=this[g](),j=f[b.idx];if("undefined"===e)return j;
"function"===e&&(c=c.call(this,j),e=h.type(c));if(null==c&&b.empty)return this;"string"===e&&(e=w.exec(c))&&(c=j+parseFloat(e[2])*("+"===e[1]?1:-1));f[b.idx]=c;return this[g](f)})})});f.hook=function(a){a=a.split(" ");j(a,function(a,c){h.cssHooks[c]={set:function(a,b){var e,i="";if("string"!==h.type(b)||(e=s(b))){b=f(e||b);if(!t.rgba&&1!==b._rgba[3]){for(e="backgroundColor"===c?a.parentNode:a;(""===i||"transparent"===i)&&e&&e.style;)try{i=h.css(e,"backgroundColor"),e=e.parentNode}catch(j){}b=b.blend(i&&
"transparent"!==i?i:"_default")}b=b.toRgbaString()}try{a.style[c]=b}catch(k){}}};h.fx.step[c]=function(a){a.colorInit||(a.start=f(a.elem,c),a.end=f(a.end),a.colorInit=!0);h.cssHooks[c].set(a.elem,a.start.transition(a.end,a.pos))}})};f.hook("backgroundColor borderBottomColor borderLeftColor borderRightColor borderTopColor color columnRuleColor outlineColor textDecorationColor textEmphasisColor");h.cssHooks.borderColor={expand:function(a){var b={};j(["Top","Right","Bottom","Left"],function(c,d){b["border"+
d+"Color"]=a});return b}};o=h.Color.names={aqua:"#00ffff",black:"#000000",blue:"#0000ff",fuchsia:"#ff00ff",gray:"#808080",green:"#008000",lime:"#00ff00",maroon:"#800000",navy:"#000080",olive:"#808000",purple:"#800080",red:"#ff0000",silver:"#c0c0c0",teal:"#008080",white:"#ffffff",yellow:"#ffff00",transparent:[null,null,null,0],_default:"#ffffff"}})(jQuery);
GitHub link here.
Just copy the entire code, place it into a normal text file and include it after jQuery.
Now, you can animate colour based properties like this :
var a = $(".navbar-default").offset().top;
$(document).scroll(function () {
if ($(this).scrollTop() > 10) {
$('.navbar-default').css("position","fixed");
$('.navbar-default').stop().animate({
'background-color': "black"
},500);
} else {
$('.navbar-default').css("position","relative");
$('.navbar-default').stop().animate({
'background-color': "red"
},500);
}
});
See working jSFiddle here.
For example I have a function called showcontainer. When I click on a button activating it, I want a certain div element, in this case <div id="container">, to fade in. And when I click it again, fade out.
How do I achieve this?
Note: I am not accustomed with jQuery.
So you got a bunch of jQuery answers. That's fine, I tend to use jQuery for this kind of stuff too. But doing that in plain JavaScript is not hard, it's just a lot more verbose:
var container = document.getElementById('container');
var btn = document.getElementById('showcontainer');
btn.onclick = function() {
// Fade out
if(container.style.display != 'none') {
var fade = setInterval(function(){
var opacity = parseFloat(container.style.opacity);
opacity = isNaN(opacity) ? 100 : parseInt(opacity * 100, 10);
opacity -= 5;
container.style.opacity = opacity/100;
if(opacity <= 0) {
clearInterval(fade);
container.style.opacity = 0;
container.style.display = 'none';
}
}, 50);
// Fade in
} else {
container.style.display = 'block';
container.style.opacity = 0;
var fade = setInterval(function(){
var opacity = parseFloat(container.style.opacity);
opacity = isNaN(opacity) ? 100 : parseInt(opacity * 100, 10);
opacity += 5;
container.style.opacity = opacity/100;
if(opacity >= 100) {
clearInterval(fade);
container.style.opacity = 1;
}
}, 50);
}
};
Check the working demo.
Provided you're not opposed to using jQuery per se, you can achieve this easily:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#showcontainer').click(function() {
$('#container').fadeToggle();
});
});
</script>
...
<div id="container">
...
</div>
...
<input type="button" id="showcontainer" value="Show/hide"/>
...
Note the missing http: in the beginning of the source of jQuery. With this trick the browser will automatically use http: or https: based on whether the original page is secure.
The piece of code after including jQuery assigns the handler to the button.
Best thing you could do is start now and get accustomed to jQuery.
The page http://api.jquery.com/fadeIn/ has all the example code that could be written here. Basically you want to have the call to fadeIn in your showcontainer function.
function showcontainer() {
$('#container').fadeIn();
}
You can have a look at jQuery UI Toggle.
The documentation turns the use of the library very simple, and they have many code examples.
You'd be as well off learning jQuery as it makes it a lot easier to do things!
From the sounds of it, you could have the container div already in the HTML but with a style of "display:none;", and then simply show it in your click event using (jQuery):
$('#container').fadeIn('slow', function() {
//Any additional logic after it's visible can go here
});